.ch{
    width: 100%;
    height: 1200px;
}
.ch-c{
    width: 1250px;
    height: 100%;
    margin: 0 auto;
    /* background-color: cadetblue; */

    
    
}
.ch-c .logo{
    /* float: left; */
    width: 100%;
    height: 41px;
    background: url(../img/p2/tbch.png) no-repeat;
    margin-top: 99px;
    margin-bottom: 69px;
    
}
.ch-c .main-l{
    float: left;
}
.ch-c .main-r{
    float: right;
}
.ch-c .content{
    
    margin-bottom: 70px;
}
.ch-c .ms{
    float: right;
    margin-top: 30px;
    margin-left: 25px;
}
.ch-c .ms .p1{
    font-size: 16px;
    color: #3a3a3a;
    line-height: 24px;
}
.ch-c .ms .p2{
    font-size: 14px;
    color: #727171;
    line-height: 24px;
}
.ch-c .ms .p3{
    font-size: 16px;
    color: #4f4f4f;
    line-height: 30px;
}
.ch-c .ms span{
    display: inline-block;
    width: 43px;
    height: 20px;
    text-align: center;
    font-size: 14px;
    color: #474646;
    line-height: 20px;
    border: 1px solid #b5b5b5;
    margin-right: 5px;
    margin-bottom: 34px;
}
.content a{
    display: inline-block;
    /* float: left; */
    position: relative;
}
.mask{
    float: left;
    position: absolute;
    left: 0;
    top: 0;
    width: 350px;
    height: 250px;
    display: none;
    background: #979ca6;
    opacity: 0.5;
    
}
.bk{
    width: 310px;
    height: 190px;
    border: 2px solid #00daed;
    margin-top: 27px;
    margin-left: 18px;

}
.content:hover .mask{
    display: block;
}
.content img{
    width: 350px;
    height: 250px;
}